FX Maverick leak out of bottle adapter?

My sudsy test shows a leak on the front of the bottle adapter, Part 16. There's a small hole in the end that faces the bottle. I can't find an O-ring size. Does anyone know off hand?

Maverick.JPG
 
Thanks to both of you. I didn't realize the Dreamilne was the same. I have Orings so easy fix.
Hope you have the right ones, the ones on the adjuster are N-90's, brittle little suckers. There is an N90 on Part 19...I think there is one more also. 70's will work but the die faster., be sure to lube them.
 
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What I had for my Dreamline wasn't all that I needed for this. I just ordered more from Oringsandmore.com based on the NBR 70 or 90 that FX listed for it.
The FX drawings were wrong last I looked, they may have changed them, not sure. I got an updated list and even it was wrong, had a HUGE o-ring in there, but it had the revised o-rings listed.